Skill Tests

Skill Test #3 Practice Questions

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• skill_test_#3_practice_questions.py

### Skill #1: LC (if only)

def evens(nums):
    """
    Takes in a list of integers and returns a list with only
    the even integers retained.

>>> nums = [0, 1, 2, 3, 4, 5, 6, 7, 8]
    >>> evens(nums)
    [0, 2, 4, 6, 8]
    """
    return

def vowels(strs):
    """
    Takes in a list of strings and returns a list with only
    the strings that have an 'a' retained. Also, the strings 
    with an 'a' are uppercased.

>>> strs = ["abc", "bcd", "cde"]
    >>> vowels(strs)
    ['ABC']
    """
    return

### Skill #2: LC (if + else)

def even_odds(nums):
    """
    Takes in a list of integers and replaces even integers with
    'e' and odd integers with 'o'.

>>> nums = [1, 2, 3, 4, 5, 6, 7, 8]
    >>> even_odds(nums)
    ['o', 'e', 'o', 'e', 'o', 'e', 'o', 'e']
    """
    return

def upper_reverse(strs):
    """
    Takes in a list of strings, if they have an even length, reverses them.
    If they have an odd length, uppercases them.

>>> strs = ["anish", "carter"]
    >>> upper_reverse(strs)
    ['ANISH', 'retrac']
    """
    return

### Skill #3: Asserts + LC

def multby2(nums):
    """
    Takes in a list of integers, asserts that the input is valid. 
    Then multiplies every integer by 2.

>>> nums = [1, 2, 3, 4, 5, "abc"]
    >>> multby2(nums)
    Traceback (most recent call last):
    ...
    AssertionError

>>> nums = (1, 2, 3, 4, 5)
    >>> multby2(nums)
    Traceback (most recent call last):
    ...
    AssertionError

>>> nums = [1, 2, 3, 4, 5]
    >>> multby2(nums)
    [2, 4, 6, 8, 10]
    """
    return

### Skill #4: LC with two for loops

def double(nums):
    """
    Multiples each number in the nested list by 2, but DOESN'T
    flatten the list.

>>> nums = [[1, 2, 3], [4, 5, 6], [7]]
    >>> double(nums)
    [[2, 4, 6], [8, 10, 12], [14]]
    """
    return

def even_odd2(nums):
    """
    Takes in a nested list of numbers and flattens it and replaces each 
    even number with 'e' and each odd number with 'o'.

>>> nums = [[1, 2, 3], [4, 5, 6], [7]]
    >>> even_odd2(nums)
    ['o', 'e', 'o', 'e', 'o', 'e', 'o']
    """
    return

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